Micro Crystal focuses on miniature quartz timing parts that sit next to the MCU: external real-time clock (RTC) modules, 32.768kHz tuning-fork crystals, and kHz oscillators. The core idea is simple: accurate timekeeping with a nanoamp-scale standby current, so battery devices can sleep most of the time, wake on a schedule, timestamp events, and still keep correct time across long intervals. https://www.microcrystal.com/en/products/real-time-clock-rtc-modules/rv-3028-c7
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A key theme is why an external RTC can matter even when the microcontroller already includes one. Internal RTC blocks can be “good enough” for basic time, but they often trade away accuracy and quiescent current, especially across temperature. Micro Crystal highlights temperature-compensated RTC options around 160nA in timekeeping mode, targeting about 2.5ppm accuracy from -40 to +85°C, which translates to predictable drift when the device is exposed to real ambient swings.
The demo also points to the RV-3028-C7 family on an evaluation board, with an emphasis on the power budget (about 45nA at 3V in timekeeping mode) and calibration (factory trim around ±1ppm at room temperature). In practical design terms, that pairs well with an I2C RTC interface (fast-mode class), backup power switchover, trickle-charge options, alarm/interrupt outputs, and features like a UNIX time counter or event timestamping for logs and audits.
Use cases called out include wearables, healthcare patches, metering, and other embedded nodes where sleep scheduling and timestamp integrity are part of the product spec rather than a “nice to have.” The conversation is framed around real design tradeoffs: battery life vs drift, BOM vs calibration effort, and when it’s worth disabling the MCU’s internal clock and letting a dedicated timing module run the system clock domain, as shown on the Embedded World North America 2025 floor today.
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